过热蒸汽发生器油燃烧器管段腐蚀

F. Naumann, F. Spies
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引用次数: 0

摘要

一个由管道制成的热交换器,通过大约8到10个大气压的过热蒸汽将油从外部从大约90摄氏度加热到170摄氏度,在管道和管道底部的滚动连接处发生了泄漏。这些管子应该由St 35.29钢制成,并在轧制连接处退火至100毫米长。外管表面由于轧制接头周围的腐蚀而形成了严重的点蚀。在蒸汽室附近的一个地方,管壁已经从外部氧化到内部。在这一地点附近,可以明显地看到侵蚀造成的沟槽。这是一个典型的裂缝腐蚀案例。轧制接头显然不是完全紧密的,因此饱和蒸汽凝结水可以渗透到缝隙中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Corroded Pipe Section of Oil Burner for Superheated Steam Generator
A heat exchanger made of a pipe in which oil was heated from the outside from approximately 90 deg C to 170 deg C, by superheated steam of about 8 to 10 atmospheres had developed a leak at the rolled joint of the pipe and pipe bottom. The pipes were supposed to be made from St 35.29 steel and annealed at the rolled joint to 100 mm length. The outer pipe surface was strongly pitted by corrosion all around the rolled joint. In the vicinity of the steam chamber the pipe wall had oxidized through from the exterior to the interior at one spot. Adjoining this spot, grooves caused by erosion were noticeable. This was a typical case of crevice corrosion. The rolled joint evidently was not entirely tight, so that saturated steam condensate could penetrate into the gap.
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